Hi there, @peterchanbyuh.

Thank you for joining this thread and adding some details. I can share some insights about entering the Social Security Number (SSN) in QBO.

The option to enter a dummy SSN is only available on the vendor's profile. If you're already accessing or filing the 1099s, you will have to enter the correct SSN to proceed with the process and avoid receiving notice from IRS.

You have to get in touch with your vendor or let them reach out to IRS to get their SSN.

Keep me posted if you have other payroll questions for me. I'm still here to help you more. Have a nice day ahead.